3 4 2 1 (a) 1 5 7 (b) -6 3 -2 2 -6 -1 7 1 -1, | 2nd row and 1st column 3rd row and 2nd column 5 -1 6 3 (c) 3 (d) -2 -1 5 -4 3 1 4 6 -2

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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please explain how to do it in two ways, using the indicated rows and columns. tell me what each way is. thanks

Evaluate the determinants of each of the following matri-
ces in two ways, using the indicated rows and columns.
Observe that you get the same answers both ways.
3
4
2
1
(a)
1
5
7
(b)
-6
3 -2
-2 -6 -1
7
1 -1
2nd row and 1st column
3rd row and 2nd column
5 -1
2
3
(c)
3
6.
(d)
-2 -1
-4
3
1
4
6 -2
1st row and 3rd row
2nd column and 3rd column
Transcribed Image Text:Evaluate the determinants of each of the following matri- ces in two ways, using the indicated rows and columns. Observe that you get the same answers both ways. 3 4 2 1 (a) 1 5 7 (b) -6 3 -2 -2 -6 -1 7 1 -1 2nd row and 1st column 3rd row and 2nd column 5 -1 2 3 (c) 3 6. (d) -2 -1 -4 3 1 4 6 -2 1st row and 3rd row 2nd column and 3rd column
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